Heat exchanger



March 1.7, 1931. o, ENGLER 1,196,707

l HEATEXGHANGER Filed Aug. 14, 1930 I l IH H l' l l I l INVENVDVR OT To E N 6 f- E R @Nam ATT-o Rusty Patented Mar. 17, 1931 Imuren STATES P-ATENTroFl-*ICE OTTO ENGLER, 0F CASSEL-WILHELMSHOHE, GERMANY, ASSIGNOR T0 SCHMIDTASCHE HEISSDAMPF-GESELLSCHAFT NL B. H., OF CASSEL-WILHELMSHOHE, GERMANY l HEAT EX'CHANGER Application led August 14, 1930, Serial No.

AThe present invention relatesl to heat exchangers of the type used in the drying, cooking, evaporating or melting of various sub- 'wound screw forming or serpentine forming coils are found, there is much left to be desired insofar as the quick carrying 0d of the condensate formed by the heating steam, which is necessary to efficient heat exchange, is concerned and previous efforts to provide for quick removal of the condensate .have resulted in complicated and entan led systems of tubes and connections. oreover there have been difficulties in obtaining a sufficient amount of heating surface in the old devices because of difficulty of arranging the heating tubes in view of manholes and other openings in the drum shell. These disadvantages are overcome by means of the present invention according to whichl the heating tubes or conduits are. formed in the shape of bows or arcs lying in substantially vertical planes and are connected to a heating steam inlet and condensate outlet header lying beneath the heating drum. By virtue of this construction and arrangement ofthe heating conduits, the heating steam streams into the heating conduits from below and the condensate simultaneously flows back down along the inner walls of the bowed heating conduits. In the'lower part of the bowed conduits, where an amount of the condensate greater than a negligible one first collects on the conduit walls, the condensate flows off on the outlying wall portion so that the opposite side of the tube which faces and heats ythe contents of the drum is directly contacted by the entering heating steam. The arrangement of the inlet and outlet conduits is'very simple since it is only necessary to connect the arced or bowed conduits with a single .inlet and discharge conduit.

At those parts of the drums where its cross-section is continuous'and unbroken, the

l$75,296, and in Germany August 23, 1929.

arced heating conduits lying in substantially vertical planes form Substantially ring shaped open loops, but at those parts of the drum where its cross-section is broken because of openings in the drum walls, the arced conduits do not 'form substantially ring shaped loops but compriseoppositely disposed, shorter arced tubes extending from the-lower level of the drum to the opening in the drumfrom either side. In this manner no diiiculties are encountered in positioning the heating conduits throughout the entire length of the drum even at points where the drum wall is broken by the openings.

tion illustrating the invention, Fig. l is a In the drawings, which show a construclongitudinal cross-section through the drum which partially follows along the line I-Ia of Fig. 2 and partially follows along the line Ibb of Fig. 3; 4

Fig. 2 is a cross-section along the II--II of Fig. l; and

Fig. 3 is a cross-section along the line III-III of Fig. 1.- v

\ The shell of the drum is formed of la plurality of substantially tubular sections oined end to end as shown and which may be connected in any convenient manner. In each section there are openings 2 for admission and removal of the material to be treated in the drum or for the entry of workmen for inspection and repair of the drum. The heating4 loops are connected by meansof forked con duits 4 as shown in Fig. 1, the outlets of the forked conduitsl leading to the exterior of the drum and being connected to conduits 5 which are'in the nature of headers and which lie on the under side of each of the drum sections as shown in Fig. 3. At those portions of the shell wherein the openings 2 occur line ' at points adjacent the aforesaid header, and

' there are pairs of oppositely disposed shorter arced .conduits 6 approaching the openings 2 from either side, in place o f the ring shaped loops occurring at other points along the 5 drum. The lower'ends of adjacent conduits 6 are connected to forked conduits llas shown in Fig. 1 andthe outlets of the forked conduits connect with header 5 as shown in Fig.v

2. The arced or bowed conduits 6 occur in the saine drum sections as the loop forming arced conduits 3 whereby the drum shell is provided with heating tubes throughout its entire length. a

The headers 5 are closed off at both ends and are provided with outlets 7 which serve to connect them with a condensate discharge conduit. The heating steam inlet tubes 8, which are of smaller diameter than the head- 5 and run substantially along the entire length of each. Tubes 8 are closed at their ends 9 but their upper .surfaces are provided with a number of openings 10 through which heating steam iiows to conduits 3 and 6 wherein it streams upwardly. The condensate formed as a'result of the heat exchange between the heating steam and the contents of the drum drips down the inner walls of the arced heat- '4'6 conduits arranged along the walls of the drum and having outlets at the under side of the drum, header positionedon the under side of the drum longitudinally of the drum and connected tothe aforesaid outlets, and a heatin steam inlet conduit connected to the hea er, the 1 aforesaid heating conduits lying in substantiall vertical planes and i shaped in the form lo arcs or bows whereby the condensate formed in .-.the bowed heating op conduits 'may readily drip'into the header.

2. A heat exchange device comprising a substantially tubular drum, a header mounted longitudinally of the drum adjacent thereto and exterior thereof, are shaped heating conduits arranged along the walls of/the drum along the entire length thereofand in parallel planes substantially at right angles to its longitudinal axis, the centers o f-said `arcs'lying, alongthe longitudinal drum axis, said arc shaped heating conduits having outlets extending tothe exterior of the drum V a heating steam inlet conduit connected to the header, said header being provided with a condensate outlet opening v 3. A heat exchange device comprising a ers 5, extend into one end of the said headers drum for the reception of material to be treated, a heating steam inlet and condensate discharge header mounted on the exterior of the drum at its under side, and heating conduits imbedded in the walls of the drum having ends connected to the aforesaid heating steam inlet and condensate discharge header, each of said heating conduits eing 'arc shaped and lying in a vertical plane substantially at right anglesto the longitudinal drum axis; 4

4. A heat exchange device comprising a drum adapted to be positioned with its 1ongitudinal axis in a horizontal plane and havmgan-opening for the reception of material to be treated, a header mounted on the exterior of the drum at its under side, a heating steam inlet conduitl connected to said header, and heating conduits imbedded in the wall of the drum along its entire length, each having leads to the aforesaid header, each of said 4heating conduits bein arc shaped and lying in a plane substantia ly at right angles to the longitudinal drum axis, the heating conduits lying in the drum wall at points remote vfrom its aforementioned .opening being in the form of open loops extending along the major portion of the cir-` cumference of the drum, the heating conduits lying in the drum wall adjacent its opening being in the form of relatively dshorter arcs extending from. points adjacent the said header to either side of the opening.

'5. Aheat exchange` deviceas claimed in claim 3 wherein the adjacent ends of pairs of adjacent arc shaped heating conduits are connected to forked tubes 4which serve to connectthe heating conduits with the heat- 'ing steam inletI and condensate discharge header. f

6. A heat exchange device comprising a substantially tubular drum having an opening for the reception of material to be treated, a header mounted along the length of the drum exteriorly thereof and adjacent thereto, aheating steam inlet conduit mounted within said -header longitudinally thereof and extending into the header for substantially its entire length, said steam inlet conduit being provided with a plurality of openingsfacmg the drum wall, heating conduits imbedded in the drum wall throughout the length'of 'the drum, each of said heating conduits being are shaped and lying in a plane substantially at right Kangles to the longitudinal drum axis, the heating conduits lying in the drum wall at points remote from its aforesaid opening being in .the form of loops extending along a major portion of the circumference of the drum, the heating conduits lying in the druml wall ladjacent its opening being -in the form-` of relatively shorter arcs extending from points' adjacent the said header to either side of the opening, e

and forked tubes connecting adjacent ends of pairs of adjacent are shaped heating conduits with the header.

7. A heat exchange device comprising a drum built up of a pluralit of substantially tubular sections' joined en tov end, each of said sections having an individual header mounted longitudinally of its exterior, are

` shaped heating conduits imbedded in the Wall of each of the sections and lying in planes substantially at right angles to the longitudinal drum axis, the ends of said arc shaped heating conduits of each section being connected to its header, and heatin steam inlet conduits connected to the hea ers, the header of each section being slightly off-set with respect to the headers of its adjacent sections to facilitate the making of connections.

In testimony-whereof, I have hereuntoset m si ature.

y gn OTTO ENGLER. 

